[PATCH] md: Remove dependancy on MD_SB_DISKS from raid0

Arrays with type-1 superblock can have more than
MD_SB_DISKS, so we remove the dependancy on that number from
raid0, replacing several fixed sized arrays with one
dynamically allocated array.

drivers/md/raid0.c

@@ -80,6 +80,13 @@ static int create_strip_zones (mddev_t *mddev)
 				conf->nr_strip_zones, GFP_KERNEL);
 	if (!conf->strip_zone)
 		return 1;
+	conf->devlist = kmalloc(sizeof(mdk_rdev_t*)*
+				conf->nr_strip_zones*mddev->raid_disks,
+				GFP_KERNEL);
+	if (!conf->devlist) {
+		kfree(conf);
+		return 1;
+	}
 
 	memset(conf->strip_zone, 0,sizeof(struct strip_zone)*
 				   conf->nr_strip_zones);
@@ -89,6 +96,7 @@ static int create_strip_zones (mddev_t *mddev)
 	zone = &conf->strip_zone[0];
 	cnt = 0;
 	smallest = NULL;
+	zone->dev = conf->devlist;
 	ITERATE_RDEV(mddev, rdev1, tmp1) {
 		int j = rdev1->raid_disk;
 
@@ -122,6 +130,7 @@ static int create_strip_zones (mddev_t *mddev)
 	for (i = 1; i < conf->nr_strip_zones; i++)
 	{
 		zone = conf->strip_zone + i;
+		zone->dev = conf->strip_zone[i-1].dev + mddev->raid_disks;
 
 		printk("raid0: zone %d\n", i);
 		zone->dev_offset = current_offset;
@@ -181,6 +190,7 @@ static int create_strip_zones (mddev_t *mddev)
 	printk("raid0: done.\n");
 	return 0;
  abort:
+	kfree(conf->devlist);
 	kfree(conf->strip_zone);
 	return 1;
 }
@@ -288,6 +298,7 @@ static int raid0_run (mddev_t *mddev)
 	conf->strip_zone = NULL;
 
 out_free_conf:
+	kfree (conf->devlist);
 	kfree(conf);
 	mddev->private = NULL;
 out:

include/linux/raid/raid0.h

@@ -8,14 +8,15 @@ struct strip_zone
 	sector_t zone_offset;	/* Zone offset in md_dev */
 	sector_t dev_offset;	/* Zone offset in real dev */
 	sector_t size;		/* Zone size */
-	int nb_dev;			/* # of devices attached to the zone */
-	mdk_rdev_t *dev[MD_SB_DISKS]; /* Devices attached to the zone */
+	int nb_dev;		/* # of devices attached to the zone */
+	mdk_rdev_t **dev;	/* Devices attached to the zone */
 };
 
 struct raid0_private_data
 {
 	struct strip_zone **hash_table; /* Table of indexes into strip_zone */
 	struct strip_zone *strip_zone;
+	mdk_rdev_t **devlist; /* lists of rdevs, pointed to by strip_zone->dev */
 	int nr_strip_zones;
 
 	sector_t hash_spacing;